Exploratory Focus Monitoring Test

Details Exploratory Focus Monitoring Test Exploratory Focus Monitoring Test

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6931j&link_type=abstract

HST Proposal ID #6931

Physics

Hst Proposal Id #6931

Scientific paper

Determination of the focus of the FOC is difficult because of the lack of aberrations. For small focus errors, it is very difficult to determine the sign of any focus error. We propose to use the field dependent astigmatism to remove this degeneracy. We will perform a fine focus sweep by moving the DOB to -1mm, -0.5mm, 0.0, +0.5mm, +1mm from nominal, and take images of a star using the F486N filter and placing the star in newly-defined apertures that are close to the edges of the field, where the field-dependent astigmatism is greatest. The appearance of the star as a function of focus will be unique, and this will allow an unambiguous determination of the focus. Before this program can be run, new apertures must be defined with size 256x256, SAMPOFF=0 and SAMPOFF=768, and LINEOFF=384.

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